9923-DK-BLU-100 is a type of Madison cable from Belden. It is a shielded, plenum-rated, 2-pair telephone cable. Its jacket is blue and its construction includes two 24 AWG solid bare copper conductors, a polyolefin insulation, an overall Beldfoil shield, and a low-smoke PVC jacket. This cable is intended for use in applications with higher plenum ratings, such as office building HVAC ducts, at a temperature range of -20°C to 75°C. It is UL listed, RoHS compliant, and meets TIA standards.